Reprojecting coordinates, British national grid

NextGIS Toolbox
1

Hello,

My British colleagues asked me to provide some coordinates in the British National Grid system. I came across this tool: NextGIS Toolbox

My coordinates are in WGS84, and I want to recalculate them to BNG. Where can I find the system parameters for this tool?

2

Hello Jerry!

This tool requires coordinate reference system parameters in PROJ format.

British National Grid: +proj=tmerc +lat_0=49 +lon_0=-2 +k=0.9996012717 +x_0=400000 +y_0=-100000 +ellps=airy +units=m +no_defs

WGS84: +proj=longlat +datum=WGS84 +no_defs

I took these parameters from CRS catalog in QGIS (qgis.org). You could also find them in sources like epsg.io